2010 and the long-term climate reconstructions - a review
Monday, January 3, 2011
Upconverting Receiver 2010
I am going on virtual dates to find
NOAA Paleoklimatologie Program Archive
, with the following result: Global and hemispheric
In the two northern hemisphere studies by Ljungqvist - as already mentioned - and
Frank et al.
(pdf format, about 4.2 MB) [1] "Reconstructed long-term decreases in CO2 concentration are indicative of positive feedbacks in the cooling transition from the Medieval Warm Period (MWP) into the Little Ice Age (LIA) (527), the MWP is clear. In the local study of Greenland Frank et al.
Kobashi et al. 
[2] "The data show clear evidence of the Medieval Warm Period and Little Ice Age in agreement with documentary evidence." (754) and - as also already erwähnt - der lokalen, nordamerikanischen Arktisstudie von
Clegg et al. [2] "The data show clear evidence of the Medieval Warm Period and Little Ice Age in agreement with documentary evidence." (754) and - as also already erwähnt - der lokalen, nordamerikanischen Arktisstudie von (pdf-Format, ca. 690 KB)[3] "For example, climatic events such as the LIA and the
Medieval Climate Anomaly (MCA; peak warmth around 1000 cal BP) oc
curred largely synchronously between our T Guiot et al.
[4] - als Conclusio - "The Medieval Warm Period (MWP) could be correlated to higher solar activity. During the 20th century, however only anthropogenic forcing can explain the exceptionally high temperature rise. Warm periods of the Middle Age were spatially more h eterogeneous than last decades, and then locally it could have been warmer." und Larocque-Tobler et al. (pdf-Format, ca. 1100 KB)[5] - im Abstract - "At the beginning of the record, corresponding to the last part of the “Medieval Climate Anomaly” (MCA) (here the period between ca 1032 and 1262 AD), the chironomid inferred mean July air temperatures were 1[Grad, W.v.B.] C warmer (p < 0.01) than the climate reference period (1961-1990).", liefern uns für Europa vergleichbare Ergebnisse.
Zu Lindholm et al. [6] kann ich wenig sagen. Sie schreiben im Abstract:
An even more prominent shift occurred in the Middle Ages, as the most severe cold spell during 1135-1164 was preceded by the warmest period only a decade earlier, during 1115-1124. The needs in regard to the average temperature, not hot. Since I did not present the original, I leave that work here are Sun .
There is still the work already mentioned several times by Neukom et al [7] In section 4.1 they write:
Our summer temperature reconstructions (Fig. 2) suggest that extended a warm period in SSA from 900 (or even earlier) to the mid-fourteenth century. This is towards the end of the Medieval Climate Anomaly (MCA; Bradley et al, 2003;. Stine 1994) as Concluded from NH temperature reconstructions, where most studies find a termination between about 1200 to 1350 (Jansen et al, 2007;. Wanner et al 2008.) . Zu Lindholm et al. [6] kann ich wenig sagen. Sie schreiben im Abstract:
An even more prominent shift occurred in the Middle Ages, as the most severe cold spell during 1135-1164 was preceded by the warmest period only a decade earlier, during 1115-1124. The needs in regard to the average temperature, not hot. Since I did not present the original, I leave that work here are Sun .
There is still the work already mentioned several times by Neukom et al [7] In section 4.1 they write:
We see that, ultimately, in all studies, except one for me eruierbare, the occurrence of MWP - by my definition - in the investigated study area was confirmed by the proxy data situation.
I'm curious how this will develop in 2011 to that effect. I hope that there will be new studies from Africa, Australia and New Zealand, not forgetting of course the equatorial regions of the world.
__________
[1] Frank et al.: Ensemble reconstruction constraints on the global carbon cycle sensitivity to climate, in: Nature, Vol. 463, pp. 527-532, 28. January 2010, doi: 10.1038/nature08769.
[3] Clegg et al.: Six millennia of summer temperature variation based on midge analysis of lake sediments from Alaska, in: Quaternary Science Reviews (2010), doi: 10.1016/j.quascirev.2010.08.001.
[4] Guiot et al.: Growing Season Temperatures in Europe and Climate Forcings Over the Past 1400 Years. PLoS ONE 5 (4): e9972. doi: 10.1371/journal.pone.0009972.
[5] Larocque-Tobler et al.: Thousand years of climate change reconstructed from chironomid subfossils preserved in varved lake Silvaplana, Engadine, Switzerland, in: Quaternary Science Reviews (2010), doi: 10.1016/j.quascirev.2010.04.018.
[6] Lindholm et al.: The height-increment record of summer temperature extended over the last millennium in Fennoscandia, in: The Holocene, doi: 10.1177/0959683610378875.
[7] Neukom et al.: Multiproxy summer and winter surface air temperature field reconstructions for southern South America covering the past centuries, in: Clim Dyn, doi: 10.1007/s00382-010-0793-3.
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